feat(compatibility): improve compatibility for Hugo basic version (#352)

assets/css/_mixin/_index.scss

@@ -1,5 +1,4 @@
 @import "_compatibility";
 @import "_link";
 @import "_blur";
-@import "_summary";
 @import "_details";

assets/css/_mixin/_summary.scss

@@ -1,101 +0,0 @@
-@mixin summary {
-  .summary {
-    padding-top: 1rem;
-    padding-bottom: .8rem;
-    color: $global-font-color;
-    border-bottom: 1px dashed $global-border-color;
-
-    [theme=dark] & {
-      color: $global-font-color-dark;
-      border-bottom: 1px dashed $global-border-color-dark;
-    }
-
-    .featured-image-preview {
-      width: 100%;
-      padding: 30% 0 0;
-      position: relative;
-      margin: 0.6rem auto;
-      @include transition(transform 0.4s ease);
-
-      img {
-        position: absolute;
-        width: 100%;
-        height: 100%;
-        left: 0;
-        top: 0;
-        @include object-fit(cover);
-      }
-
-      &:hover {
-        @include transform(scale(1.01));
-      }
-    }
-
-    .single-title {
-      font-size: 1.25rem;
-      line-height: 140%;
-      margin: 0.4rem 0;
-    }
-
-    .content {
-      @include box(vertical);
-      -webkit-line-clamp: 3;
-      margin-top: .3rem;
-      width: 100%;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      @include overflow-wrap(break-word);
-      color: $global-font-secondary-color;
-
-      [theme=dark] & {
-        color: $global-font-secondary-color-dark;
-      }
-
-      h2,
-      h3,
-      h4,
-      h5,
-      h6,
-      p {
-        font-size: 1rem;
-        line-height: 1.5;
-        display: inline;
-
-        &::after {
-          content: "\A";
-          white-space: pre;
-        }
-      }
-
-      h2 {
-        font-size: 1.125rem;
-      }
-
-      @include link(false, true);
-
-      b, strong {
-        color: $global-font-secondary-color;
-
-        [theme=dark] & {
-          color: $global-font-secondary-color-dark;
-        }
-      }
-    }
-
-    .post-footer {
-      margin-top: .4rem;
-      display: flex;
-      justify-content: space-between;
-      align-items: center;
-      font-size: .875rem;
-
-      @include link(false, false);
-
-      .post-tags {
-        padding: 0;
-
-        @include link(true, true);
-      }
-    }
-  }
-}